*{margin: 0;padding: 0;}

li{list-style: none;}

body{
    background-color: rgb(241, 242, 246);
}

.fl{
    float: left;
}

.fr{
    float: right;
}

.clear:after{
    content: "";
    height: 0;
    display: block;
    clear: both;
}

.mt{
    margin-top: 20px;
}

.mb{
    margin-bottom: 20px;
}


.ml{
    margin-left: 20px;
}

.mr{
    margin-right: 20px;
}


/**
  样式:隐藏滚动条

*/
::-webkit-scrollbar{
    display: none;
}
